When you're an addict, you can go without feeling anything except drunk or stoned or hungry. Still, when you compare this to other feelings, to sadness, anger, fear, worry, despair, and depression, well, an addiction no longer looks so bad. It looks like a very viable option.
We all build internal sea walls to keep at bay the sadnesses of life and the often overwhelming forces within our minds. In whatever way we do this--through love, work, family, faith, friends, denial, alcohol, drugs, or medication, we build these walls, stone by stone, over a lifetime.